"I think China clearly interfered," said Chang, the author of "The Coming Collapse of China."
Chang said that in the run-up to the election, China "tried to cause chaos."
"Large Chinese networks like 'Spamouflage Dragon' relentlessly attacked the president on YouTube, Facebook, and Twitter," Chang said. "We know that the social media platforms have taken down a massive number of fake Chinese accounts."
He said China was "substantially involved in our elections," with "these malicious disinformation campaigns on the surface, with these troll and bot farm operations below the surface."
"They were involved, and they’ve been involved for a very long time," he said.
Director of National Intelligence John Ratcliffe told CBS News last week that China interfered in the 2020 election. However, a required intelligence community assessment report on foreign election interference that was due last Friday has been delayed because of clashes among senior officials over the communist regime's role.
Chang said Dec. 17 in an interview with WMAL radio in Washington that House Intelligence Committee member Rep. Eric Swalwell, D-Calif. was promoting the Chinese Communist Party's narrative with his charge of Russian interference.
Swalwell was among the politicians reported by Axios earlier this month who developed ties with a suspected Chinese intelligence operative who was part of an operation run by China’s main civilian spy agency.